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NEET levelSingle correct optionDifficulty 1 of 3mt195

Most metal oxide lines in the Ellingham diagram slope upward with temperature because

Athe metal melts
Bthe reaction is always endothermic
Coxygen is released in the reaction
Dgaseous oxygen is consumed, so entropy decreases and $Δ S^{\circ}$ is negative

Answer: D

2 M + O X_{2} 2 MO

removes one mole of gas, so

Δ S^{\circ} < 0

. Since

Δ G^{\circ} = Δ H^{\circ} - T Δ S^{\circ}

, the slope

- Δ S^{\circ}

is positive.

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